a = 20
b = 10

print(a + b)
print(a - b)
print(a * b)

c = 0
# print(a / c)  # 除数不能为零
print(a / b)
print(a % b)  # 取余数

d = 2
e = 3
print(d ** 3)  # 2的3次方

print(d // e)  # 取商数
